X1 and X2 start in corner and pass back and forth as the go down ice on the outside (be inside face off circles), when they get to the far end they come back up the ice and continue the drill up the middle of the ice to far end where they transition again and go up ice on far boards, so player that was on wall to start should be in middle if they transitioned right during the drill.
They can stop at opposite corner and when all players are done they return the other direction.

Controlled passing
One touch passing